But the interview took a decidedly somber turn when the question came up as to whether there were any artists Grohl was unable to book for the blowout, which will take place at Glen Helen Regional Park in San Bernardino, CA.

It was at this point that Grohl, who is certainly known for his indefatigably positive energy, broke character, retreating into an interlude of pensive silence, according to the interview.

"We wanted to have Soundgarden. They had agreed to do it. And, um ...[it] didn't happen."

Grohl remained close friends with Cornell since the pair's early days shaping Seattle's generation-defining grunge scene. Holding back tears, Grohl continued to reminisce about his late friend.

"He was a really sweet guy. Full of life. And he had so much to offer. That one hurt."

Having suffered through ex-Nirvana bandmate Kurt Cobain's suicide in the mid-'90s, the former Nirvana drummer expressed deep sympathy for all the loved ones in Cornell's life, commiserating, "I felt for his family. And I felt for his band, you know? Because that's a long road, man."

Following another interregnum of silence, Grohl breaks, "every time it happens, the same feeling comes up," recounting the painful series of unexpected suicides that have taken place between Cobain, Cornell, and most recently, Linkin Park's Chester Bennington.

"It's shocking and confusing and I just don't get it. You get into this with a love of music, and sharing it with people, and you hope everybody feels the same way. I know it's more complicated than that ... but, f—. It just sucks."

Grohl and Foo Fighters drummer Taylor Hawkins took to a New Zealand radio station last week and opened up about their frustrations with the stigma surrounding depression and mental health.

Closing the book on the painful topic, Grohl offered left readers with a piece of advice. "I've always felt like the most important thing is just to get home safe. You just gotta keep on keeping on."